2 Mode of Operation Application The LDP Vehicle Loop Detector is based on microprocessor technology, which has enabled a large number of functions to be implemented. The functions are primarily for use in the Parking/Access Control Industry like control for gates, barriers, fences, etc. Standard operations are implemented including programmable pulse and presence option. Principle The Vehicle Loop Detector is based on the inductive principle, using a coil of wire buried in the driveway and connected to the loop detector. The change in inductance will be measured as a change in frequency. The output relay activates when the loop is activated and releases again when the loop returns to a non-activated condition. Setup The loop has to be in a passive condition (no object in the loop area) during startup and adjustment. The loop detector will automatically calibrate when the reset button has been activated, which will be indicated by the yellow LED flashing. The functioning can now be checked by activating the loop with the actual object. Now the yellow LED will go on, and the output relay will be activated according to the dip-switch settings. If the loop detector does not react, the sensitivity must be manual adjusted by means of the dip-switches. Important: reset the system after changing the Dipswitch settings. Temperature compensation The frequency will increase as a result of decreasing temperatures and vice versa. To compensate for this, or any other situation that courses slowly change in frequency, the LD auto tunes constantly. That means if the frequency changes slowly there will be no detection. The auto tune function compensates for both increasing or decreasing in frequency. Fault detection This function is useful if the cable disconnect. The alarm will be indicated via the red LED in front of the housing. This LED is constantly lighting when the loop is open or too large and flashing when a short circuit occurs or a loop is too small. Loop Under Roadway Sensitivity 8 sensitivity settings are available on the dip-switches in front of the module, to allow flexibility in configuration and application (Compensation for variation in loop construction). Reset switch The reset switch enables the detector to be manually reset during commissioning and testing. The detector will re-tune the sensing loop and become ready for vehicle detection. Relay output The single loop detector has two SPDT relays one for pulse output and one for presence output. The dual loop detector has two SPST relays one for each loop. Pulse output (one shot): It is possible to select the length of the output period to 0.2s or 1 second. The pulse output can be setup to activate on detection of a vehicle or when the vehicle leaves the loop. Presence output: The output will be activated as long as there is a vehicle parked in the loop. It will be possible to activate a filter (-delay of 2 seconds), which prevents a false detection from a small or fast moving object. Pulse output mode The relay activates only for a short period when the vehicle enters or leaves the loop. Permanent output mode The relay will remain active as long as there is a vehicle parked in the loop. Extends the pulse length from 0.2 sec to 1 sec. On-delay Prevents false detections of small or fast moving objects. Sense boost (only single channel loop detector) This feature sets the undetected level to maximum sensitivity and is used to prevent loss of detection of high-bed vehicles. Selectable frequency The frequency of the loop is determined by the inductance of the loop and the frequency switch setting. If the frequency switch is on, the frequency is reduced. It may be necessary to change the frequency to prevent cross talk between adjacent loops. The frequency function will only change the frequency of one channel of the dual loop detector. Important: Be careful when installing the detector next to another inductive load, as this can have an effect on the detector and cause false detections. Operation Diagram LDP1 / Presence and Pulse mode Vehicle Entering Vehicle Leaving Loop Relay 1, Presence t : 2 s 2 Specifications are subject to change without notice ( )

4 Dip Switch Settings LDP1 LDP2 Sensitivity Minimum Maximum sec 0.2 sec 4 4 Leaving A 8 8 Entering 2 sec On B 1 sec 0.2 sec 4 4 Leaving Pulse 7 7 A 8 8 Entering 2 sec Pulse mode On delay Sensitivity boost Loop frequency Cross talk Presence Pulse/presence mode B Pulse mode On delay Loop frequency Cross talk Direction logic Function The Dual loop detector (LDP2) is implemented with direction logic as standard. The function enables the detector to give a pulse output on relay#1 for a vehicle travelling from loop 1 to loop 2 and a pulse output on relay#2 for a vehicle travelling from loop 2 to loop 1. Direction Relay 2 Important: Reset the detector after changing the Dip-switch settings If a vehicle is detected, and the corresponding direction is indicated, both loops must be in a non-activated condition again before the next object can be detected. For Direction logic mode set Dipswitch 5 to Entering and Dipswitch 7 to Presence. Relay 1 Direction Loop Diagram Loop installation The loop geometry must be adapted to the respective application. The setup will be optimal if the loop has the same size as the object to be detected. After determining the loop geometry, a groove must be cut in the ground for installing the loop. Cut an inclined groove of 45 angle at the corners of the loop, which will protect it from excessive wear. Clean the groove for moisture and place the wire as tight as possible along the button of the groove. Before sealing up the groove, it is recommandable to check the loop inductance using a measuring device. Optimum value: µh. When sealing up the groove, ensure that the temperature of the sealing compound does not exceed the max temperature of the loop insulation, as this might cause an earth fault. Loop turns The number of turns strongly depends on the circumference of the loop. The smaller the loop, the more turns are required. Cable Recommandations - Use 1.5mm squared cable. Use silicon coated cable, if placed directly into the ground - Use 2m of spacing between two adjacent loops. - Use screened feeder cable in electrically noisy environments or where feeder runs parallel to power cables. Max Max depth depht into road: 50mm Typical 30 mm Loop circumference No. of turns (m) > < mm Twisted wire --> 20 Twisted turns wire per meter -> 20 turns per meter max length: 20 mt max lenght: 20 m 45 2 m 1 m ROAD 300 mm 4 Specifications are subject to change without notice ( )

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